npgsql CLR 枚举类型必须在使用前向 Npgsql 注册

Question

I am trying to map my enum at my DBContext but it keeps show and error that my enum type is not registered with Npgsql. I have already registered at the static method but it shows an error that my enum is not registered by the clr is there anything i missed out?

Error

---> System.NotSupportedException: The CLR enum type enumsetone must be registered with Npgsql before usage, please refer to the documentation.

DBContext.cs

public virtual DbSet<Response> response { get; set; }

static void RegisterTypes()
{
       NpgsqlConnection.GlobalTypeMapper.MapEnum<enumsetone>();
       NpgsqlConnection.GlobalTypeMapper.MapEnum<enumsettwo>();
}

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
       modelBuilder.HasDefaultSchema("public");
       modelBuilder.HasPostgresEnum<enumsetone>();
       modelBuilder.HasPostgresEnum<enumsettwo>();
}

Startup.cs

public virtual void ConfigureServices(IServiceCollection services)
{
       DBContext.RegisterTypes();
       services.AddDbContextPool<DBContext>(options => options.UseNpgsql(_configuration.GetConnectionString("PostgresSqlDb")));
}

Enumsetone.cs

[JsonConverter(typeof(StringEnumConverter))]
public enum Enumsetone
{
    GET,
    POST
}

Response.cs

[Table("response", Schema = "public")]
public class Response
{
    [Key]
    [Column("id")]
    public Guid ResponseId { get; set; }
    [Column("source")]
    public enumsetone Source { get; set; }
    [Column("destination")]
    public enumsetone Destination { get; set; }
    [Column("status_code")]
    public enumsettwo EnumSetTwo { get; set; }
        
}

Answer 1

I faced similar proble on EF Core 5.0. ORM uses default name translator (which is PaskalCase to snake_case) to get the name of the postgres enum type. In your example name of the enum is Enumsetone so postgres type should have name enumsetone. You can check the name by invoking

string name = NpgsqlConnection.GlobalTypeMapper.DefaultNameTranslator.TranslateTypeName(typeof(YourEnum).Name);